By = indicating place - near, beside, next to:
Somebody is standing by my car, oh it's a policeman.
With a verb of motion by has the same meaning as past:
We drove past the cinema.
By = indicating means, method - a way of doing something:
He went out by the back door.
talking about a means of transport:
I always go to work by bus.
By followed by a passive verb:
The Mona Lisa was painted by Leonardo da vinci
By as a preposition indicating time:
The car will be ready by next week.
By in idioms:
by hand, by day, by night, by no means
Yes, you can use the word but as a preposition. It is a preposition the same as about, by, for, and than.
you use a preposition usally at the end of a sentence.
You use a preposition in a prepositional phrase, such as "I will be with you in a minute."
After preposition we use object.
use the preposition
Prejudice foolowed by preposition ?
When can you use than as a preposition rather than a conjunction?
no
no
At is a preposition. And is a conjunction.
at by
after noun